<?php
/** 
 * @version V4.92a 29 Aug 2006 (c) 2000-2006 John Lim (jlim#natsoft.com.my). All rights reserved.
 * Released under both BSD license and Lesser GPL library license. 
 * Whenever there is any discrepancy between the two licenses, 
 * the BSD license will take precedence. 
 *
 * Set tabs to 4 for best viewing.
 * 
 * PEAR DB Emulation Layer for ADODB.
 *
 * The following code is modelled on PEAR DB code by Stig Bakken <ssb@fast.no>                                                             |
 * and Tomas V.V.Cox <cox@idecnet.com>. Portions (c)1997-2002 The PHP Group.
 */

 /*
 We support:
 
 DB_Common
 ---------
        query - returns PEAR_Error on error
        limitQuery - return PEAR_Error on error
        prepare - does not return PEAR_Error on error
        execute - does not return PEAR_Error on error
        setFetchMode - supports ASSOC and ORDERED
        errorNative
        quote
        nextID
        disconnect
        
        getOne
        getAssoc
        getRow
        getCol
        getAll
        
 DB_Result
 ---------
        numRows - returns -1 if not supported
        numCols
        fetchInto - does not support passing of fetchmode
        fetchRows - does not support passing of fetchmode
        free
 */
 
define('ADODB_PEAR',dirname(__FILE__));
include_once "PEAR.php";
include_once ADODB_PEAR."/adodb-errorpear.inc.php";
include_once ADODB_PEAR."/adodb.inc.php";

if (!defined('DB_OK')) {
define("DB_OK", 1);
define("DB_ERROR",-1);

// autoExecute constants
define('DB_AUTOQUERY_INSERT', 1);
define('DB_AUTOQUERY_UPDATE', 2);

/**
 * This is a special constant that tells DB the user hasn't specified
 * any particular get mode, so the default should be used.
 */

define('DB_FETCHMODE_DEFAULT', 0);

/**
 * Column data indexed by numbers, ordered from 0 and up
 */

define('DB_FETCHMODE_ORDERED', 1);

/**
 * Column data indexed by column names
 */

define('DB_FETCHMODE_ASSOC', 2);

/* for compatibility */

define('DB_GETMODE_ORDERED', DB_FETCHMODE_ORDERED);
define('DB_GETMODE_ASSOC',   DB_FETCHMODE_ASSOC);

/**
 * these are constants for the tableInfo-function
 * they are bitwised or'ed. so if there are more constants to be defined
 * in the future, adjust DB_TABLEINFO_FULL accordingly
 */

define('DB_TABLEINFO_ORDER', 1);
define('DB_TABLEINFO_ORDERTABLE', 2);
define('DB_TABLEINFO_FULL', 3);
}

/**
 * The main "DB" class is simply a container class with some static
 * methods for creating DB objects as well as some utility functions
 * common to all parts of DB.
 *
 */

class DB
{
        /**
         * Create a new DB object for the specified database type
         *
         * @param $type string database type, for example "mysql"
         *
         * @return object a newly created DB object, or a DB error code on
         * error
         */

        function &factory($type)
        {
                include_once(ADODB_DIR."/drivers/adodb-$type.inc.php");
                $obj = &NewADOConnection($type);
                if (!is_object($obj)) $obj = new PEAR_Error('Unknown Database Driver: '.$dsninfo['phptype'],-1);
                return $obj;
        }

        /**
         * Create a new DB object and connect to the specified database
         *
         * @param $dsn mixed "data source name", see the DB::parseDSN
         * method for a description of the dsn format.  Can also be
         * specified as an array of the format returned by DB::parseDSN.
         *
         * @param $options mixed if boolean (or scalar), tells whether
         * this connection should be persistent (for backends that support
         * this).  This parameter can also be an array of options, see
         * DB_common::setOption for more information on connection
         * options.
         *
         * @return object a newly created DB connection object, or a DB
         * error object on error
         *
         * @see DB::parseDSN
         * @see DB::isError
         */
        function &connect($dsn, $options = false)
        {
                if (is_array($dsn)) {
                        $dsninfo = $dsn;
                } else {
                        $dsninfo = DB::parseDSN($dsn);
                }
                switch ($dsninfo["phptype"]) {
                        case 'pgsql':   $type = 'postgres7'; break;
                        case 'ifx':             $type = 'informix9'; break;
                        default:                $type = $dsninfo["phptype"]; break;
                }

                if (is_array($options) && isset($options["debug"]) &&
                        $options["debug"] >= 2) {
                        // expose php errors with sufficient debug level
                         @include_once("adodb-$type.inc.php");
                } else {
                         @include_once("adodb-$type.inc.php");
                }

                @$obj =& NewADOConnection($type);
                if (!is_object($obj)) {
                        $obj = new PEAR_Error('Unknown Database Driver: '.$dsninfo['phptype'],-1);
                        return $obj;
                }
                if (is_array($options)) {
                        foreach($options as $k => $v) {
                                switch(strtolower($k)) {
                                case 'persist':
                                case 'persistent':      $persist = $v; break;
                                #ibase
                                case 'dialect':         $obj->dialect = $v; break;
                                case 'charset':         $obj->charset = $v; break;
                                case 'buffers':         $obj->buffers = $v; break;
                                #ado
                                case 'charpage':        $obj->charPage = $v; break;
                                #mysql
                                case 'clientflags': $obj->clientFlags = $v; break;
                                }
                        }
                } else {
                        $persist = false;
                }

                if (isset($dsninfo['socket'])) $dsninfo['hostspec'] .= ':'.$dsninfo['socket'];
                else if (isset($dsninfo['port'])) $dsninfo['hostspec'] .= ':'.$dsninfo['port'];
                
                if($persist) $ok = $obj->PConnect($dsninfo['hostspec'], $dsninfo['username'],$dsninfo['password'],$dsninfo['database']);
                else  $ok = $obj->Connect($dsninfo['hostspec'], $dsninfo['username'],$dsninfo['password'],$dsninfo['database']);
                
                if (!$ok) $obj = ADODB_PEAR_Error();
                return $obj;
        }

        /**
         * Return the DB API version
         *
         * @return int the DB API version number
         */
        function apiVersion()
        {
                return 2;
        }

        /**
         * Tell whether a result code from a DB method is an error
         *
         * @param $value int result code
         *
         * @return bool whether $value is an error
         */
        function isError($value)
        {
                if (!is_object($value)) return false;
                $class = get_class($value);
                return $class == 'pear_error' || is_subclass_of($value, 'pear_error') || 
                                $class == 'db_error' || is_subclass_of($value, 'db_error');
        }


        /**
         * Tell whether a result code from a DB method is a warning.
         * Warnings differ from errors in that they are generated by DB,
         * and are not fatal.
         *
         * @param $value mixed result value
         *
         * @return bool whether $value is a warning
         */
        function isWarning($value)
        {
                return false;
                /*
                return is_object($value) &&
                        (get_class( $value ) == "db_warning" ||
                         is_subclass_of($value, "db_warning"));*/
        }

        /**
         * Parse a data source name
         *
         * @param $dsn string Data Source Name to be parsed
         *
         * @return array an associative array with the following keys:
         *
         *  phptype: Database backend used in PHP (mysql, odbc etc.)
         *  dbsyntax: Database used with regards to SQL syntax etc.
         *  protocol: Communication protocol to use (tcp, unix etc.)
         *  hostspec: Host specification (hostname[:port])
         *  database: Database to use on the DBMS server
         *  username: User name for login
         *  password: Password for login
         *
         * The format of the supplied DSN is in its fullest form:
         *
         *  phptype(dbsyntax)://username:password@protocol+hostspec/database
         *
         * Most variations are allowed:
         *
         *  phptype://username:password@protocol+hostspec:110//usr/db_file.db
         *  phptype://username:password@hostspec/database_name
         *  phptype://username:password@hostspec
         *  phptype://username@hostspec
         *  phptype://hostspec/database
         *  phptype://hostspec
         *  phptype(dbsyntax)
         *  phptype
         *
         * @author Tomas V.V.Cox <cox@idecnet.com>
         */
        function parseDSN($dsn)
        {
                if (is_array($dsn)) {
                        return $dsn;
                }

                $parsed = array(
                        'phptype'  => false,
                        'dbsyntax' => false,
                        'protocol' => false,
                        'hostspec' => false,
                        'database' => false,
                        'username' => false,
                        'password' => false
                );

                // Find phptype and dbsyntax
                if (($pos = strpos($dsn, '://')) !== false) {
                        $str = substr($dsn, 0, $pos);
                        $dsn = substr($dsn, $pos + 3);
                } else {
                        $str = $dsn;
                        $dsn = NULL;
                }

                // Get phptype and dbsyntax
                // $str => phptype(dbsyntax)
                if (preg_match('|^(.+?)\((.*?)\)$|', $str, $arr)) {
                        $parsed['phptype'] = $arr[1];
                        $parsed['dbsyntax'] = (empty($arr[2])) ? $arr[1] : $arr[2];
                } else {
                        $parsed['phptype'] = $str;
                        $parsed['dbsyntax'] = $str;
                }

                if (empty($dsn)) {
                        return $parsed;
                }

                // Get (if found): username and password
                // $dsn => username:password@protocol+hostspec/database
                if (($at = strpos($dsn,'@')) !== false) {
                        $str = substr($dsn, 0, $at);
                        $dsn = substr($dsn, $at + 1);
                        if (($pos = strpos($str, ':')) !== false) {
                                $parsed['username'] = urldecode(substr($str, 0, $pos));
                                $parsed['password'] = urldecode(substr($str, $pos + 1));
                        } else {
                                $parsed['username'] = urldecode($str);
                        }
                }

                // Find protocol and hostspec
                // $dsn => protocol+hostspec/database
                if (($pos=strpos($dsn, '/')) !== false) {
                        $str = substr($dsn, 0, $pos);
                        $dsn = substr($dsn, $pos + 1);
                } else {
                        $str = $dsn;
                        $dsn = NULL;
                }

                // Get protocol + hostspec
                // $str => protocol+hostspec
                if (($pos=strpos($str, '+')) !== false) {
                        $parsed['protocol'] = substr($str, 0, $pos);
                        $parsed['hostspec'] = urldecode(substr($str, $pos + 1));
                } else {
                        $parsed['hostspec'] = urldecode($str);
                }

                // Get dabase if any
                // $dsn => database
                if (!empty($dsn)) {
                        $parsed['database'] = $dsn;
                }

                return $parsed;
        }

        /**
         * Load a PHP database extension if it is not loaded already.
         *
         * @access public
         *
         * @param $name the base name of the extension (without the .so or
         * .dll suffix)
         *
         * @return bool true if the extension was already or successfully
         * loaded, false if it could not be loaded
         */
        function assertExtension($name)
        {
                if (!extension_loaded($name)) {
                        $dlext = (strncmp(PHP_OS,'WIN',3) === 0) ? '.dll' : '.so';
                        @dl($name . $dlext);
                }
                if (!extension_loaded($name)) {
                        return false;
                }
                return true;
        }
}

?>
